2024 — Ontario Building Code

If you are a homeowner reading this because you want to pull a permit for a garage or a basement apartment, the Ontario Building Code 2024 changes your game plan.

Myth 1: “The 2024 code only applies to new builds.” Fact: It applies to any renovation requiring a permit, including additions, basement finishing, and window replacement.

Myth 2: “My contractor knows the code – I don’t need to read it.” Fact: Many contractors are unaware of the stair tread and CO alarm changes. Always verify. ontario building code 2024

Myth 3: “Small buildings (sheds, garages) are exempt.” Fact: Detached garages under 10 sq.m. (108 sq.ft.) are exempt, but any garage with heating or a door connected to the house triggers CO alarm requirements.

Myth 4: “The code doesn't apply to renovations in rural areas.” Fact: The OBC applies province-wide, regardless of municipality. Enforcement may vary, but liability remains. If you are a homeowner reading this because

Despite higher upfront costs, homeowners will see 20–30% heating/cooling cost reductions. The province also offers the Home Renovation Savings Program (2024) rebates up to $5,000 for achieving code-minimum energy performance.

To directly combat the housing shortage, the 2024 OBC includes regulatory relaxations for Additional Residential Units (ARUs), often referred to as laneway suites or garden suites. Despite higher upfront costs, homeowners will see 20–30%

If you are roughing in a basement, listen up. The 2024 code now mandates backwater valves on any new building where the lowest floor is below the street sewer level.

If you are planning a project in 2024, follow this checklist:

The 2024 code integrates more stringent Accessibility for Ontarians with Disabilities Act (AODA) requirements into the core building code. Key changes include:

Adopting the Ontario Building Code 2024 will increase construction costs, but also long-term savings.